Repair lock



March 31, 1942. v SCOTT REPAIR LOCK Filed Nov. 28, 1940 2 Sheets-Sheet l lop.

L. B. SCOTT REPAIR LOCK March 31, 1942.

2 Sheets-Sheet Filed Nov. 28, 1940 W Wm M5 Q C w W w o Patented Mar. 31, 1942 UNITED STATES PATENT OFFICE Application November 28, 1940, Serial No. 367,539

2 Claims. (of. 18936) This invention relates to new and useful improvements in methods of and means for repairing and reinforcing structures where fractures have occurred or at points of excessive strain.

One object of the invention is to provide an improved method of repairing cracks and fractures in structures without the use of heat or molten metal and which involves sealing the crack or fracture with cold, hard metal locks and cold, malleable metal.

Another object of the invention is to provide an improved method of repairing vcracks and fractures in structures wherein the cold, hard metal lock is used as a guide for formingthe recess in the metal to be repaired, so that said lock may be snugly locked into the repaired metal.

A still further object of the invention is to provide an improved method of repairing cracks and fractures in structures, wherein a metal lock is utilized to force the crack or fracture into a vention will be hereinafter described, together.

with other features of the invention.

- The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings, in which an example of the invention is shown, and

wherein:

Figure 1 is a plan view of a plate, constructed in accordance with the invention, and showing one step ,in the formation of said plate,

Figure 2 is a view similar to Figure 1, showing further steps in the formation of the plate,

Figure 3 is a plan view, showing a plate formed in accordance with the invention,

Figure 4 is a plan view of a'cracked structure having a recess cut therein,

Figure 5 is a plan view, showing the plate inserted into the recess of the structure,

Figure 6 is a plan view, showing the structure with the plate in position and holes drilled in the structure to receive locking pins,

Figure 7 is a horizontal cross-sectional view, showing one method of locking the plate in position within the structure, 1

v ceive locking pins;

all

Figure 8 is a horizontal cross-sectional view,

showing another form of the plate which may be used in this method.

thereof (Figure 3).

Figure 13 is a plan view, showing a further modification of the plate mounted in a fractured structure,

Figure 14 is a plan view, showing a different manner in which the holes in the plate and the structure may be formed, and

Figure 15 is a horizontal cross-sectional view,

showing one method of employing the plates in accordance with-the invention.

In the art of repairing fractures and castings, there have been devised numerous locks of both hot and cold metal; however, heretofore, all of these locks have been small in diameter. Previously, there has not been any method of removing a large portion of the surface around the crack or fracture, or the fatigued metal, and inserting a plate in the recess formed by this removal; said plate being sealed or lockedinto the casting. by a cold, malleable metal.

In the drawings, the numeral I 0 designates a rectangular-shaped piece of metal. It is pointed out that any suitably-shaped metallic piece could be employed. This metal is preferably very hard and very tough so that it will withstand a great amount of stress. Obviously, any material other than metal that is suitable for the purpose could be used. A similar piece of metal H is clamped, or otherwise secured to one lateral edge of the piece of metal l0 so as to have one lateral edge of the piece -I l abutting one lateral edge of .the piece l0. Along the line of contact of the two pieces of metal, a plurality of holes II are drilled so that a plurality of semi-circles H are provided in the abutting edges of each piece of metal. The block of metal I I is then removed from the edge of the aforementioned metal I0 and the opposite edges of the plates are clamped together, as shown in Figure 2. A plurality of holes l3, similar to the holes 12, are drilled therethrough in the manner described hereina'bove. Thus a plate of metal is formed having a plurality of semi-circles in both lateral edges y 2,27s,ss4 casting H. which" is desired to repair,

has a recess- I! cut therein, contiguousfto the crack within said metal. The recess l5 may be-cf any depth, and if thedepth thereof is greater thflfifih. thicknessofthe plate, more than one 'pa e ay be employed, as is hereinafter described-iThe recess is formed in substantially v "the same. shape as the plate l0, so that the plate will fit into said recess.

The plate I9 is placed within the recess l5 (Figure 5), and a drill (not shown) is used to form a plurality of semi-circles I6 in the casting along the lateral sides of the recess. As can be seen in-the drawings, the semi-circles 18 within the casting and the semi-circles I2 carried by the plate l9 form continuous circles. Within said complete circles, a suitable pin ll may be inserted, and there has been shown in the drawings (Figure 7) a screw-threaded pin H which locks the plate in the casting M. It is pointed out that tapered pins or the lock shown in my Patent No. 2,195,741, issued April 2, 1940, or the type of look as shown in my pending application, Serial No.-259,594, filed March 3, 1939, may be used; Thus said plate can be securely locked in the casting and with the use of a suitable type of lock, such as is shown in my previous applications, said plate may be sealed so as to hold pressure within the casting.

There is shown in Figure 8 another method of forming the recess l5 and the plate Ill, which is merely a dovetailed construction, so that when pins or locking means, such as pins H, are inserted between the casting and the plate, the plate will be more firmly locked in the casting.

There is shown in Figure 9 a plate l8, identical to the plate l0, except that in place of the semi-circles l2 being formed in the sides thereof, a square punch (not shown) is used so as to form triangular-shaped openings l9 along the lateral edges of the plate. Said plate is inserted in a recess formed in the casting, and triangularshaped openings 2| are cut in the casting in a manner similar to that wherein the semi-circles are cut. Suitable pins 22 are placed in the openings I9 and 2| and forced into position. In this particular form of the invention, the triangularshaped openings co-act to secure the plate very securely to the casting. As is shown in Figure 14, the triangular-shaped openings l9 and 2i may be spaced-apart, and it is pointed out that the semi-circles l2, as previously described, may also be spaced in this manner. Thus it can be seen that various types of indentures along the edges of the plate may be used, and that any suitable spacing of said indentures may be used so long as said plate is securely locked into the casting.

In Figure 15, there is shown a casting 23 having a crack 24 therein. A recess 25 is formed in the casting to receive locking plates 26. The bottom of the recess 25 is smaller in cross-sectional area than the top, of said recess, so that the recess is stair-stepped upwardly toward the surface of the casting. The plates 26, which fit into the recess, grow progressively larger toward the surface, as is shown in Figure 15. Obviously, any desirable number of stairsteps and any desirable number of plates 26 may be utilized. This method of repair is very desirable for use in heavy castings wherein stresses of large magnitude occur. The plates 26 may be secured to the casting 23 by any suitable means such as the circular pins 11 or the square pins 22.

Still another modiflcatlon of the invention is shown in-Figure 13. In this form. a Plate 21 is used. The plate 2'l-is substantially rectangular in shape, and is provided with a laterally-extend ing lug 28 at each end of either side of said plate. Semi-circular recesses 29, are formed about the edges of the plate and the lugs. A recess 39, being substantially the shape of the plate 21, is formed in the casting I4 transverse to the fracture therein, so as to receive the plate. Semicircular recesses 3| are formed in the walls of the recess 30 so as to complement the semi-circular recesses 29 and form circular openings 32 therewith. The recesses 29 and 3| could be triangular in shape, or have any other suitable or desirable configuration. Pins 33, preferably screw-threaded, engage in the openings 32 and are forced into position so as to lock the plate 21 to the casting ll. The recesses 29 may be formed in the same manner as the recesses l2 described in connection with the first form of the invention. The recesses 3| are formed after the plate 21 is in position within the recess 30 so that the recesses 29 may serve as a guide.

This form of the invention possesses especial utility for use in instances where it is desired to close the fracture in the casting as much as possible. In, installing this form of the lock, the pins 33' which are positioned on the inner sides of the lugs 29 are forced into position first. Obviously, this operation forces the fracture together since the casting will tend to move away from the pins 33. The remaining pins 33 are positioned subsequent to this operation. In this manner, the fracture is first closed and then held closed by the plate 21.

All of the forms of the invention have similar characteristics. Each embodies forming a recess 9 in the fractured casting transverse to the fracture, and securing a relatively larg lock plate in said recess by means of locking pins, so that said plate is securely anchored to the casting and prevents subsequent damage thereto.

Various changes, alterations and modifications may be made in the size, shape and arrangement of the herein described elements, within the scope of the appended claims.

What I claim and desire to secure by Letters Patent is:

I including a member formed for insertion in an opening provided therefor in the structure, said opening intersecting the fracture and having its side walls formed with cut-outs complementary to corresponding cut-outs that are formed in the side walls of the member whereby to form sockets, said sockets having their walls of undulating form, and pins in the sockets conformably engaging the undulating walls thereof for locking the member in the opening.

LAWRENCE B. SCOTT. 

